World and Olympic pommel horse champion Teng Haibin is out of the Olympic Games in London after injuring his arm.

The defending champion Chinese men have replaced injured Teng Haibin with alternate Guo Weiyang, four days before competition begins at the 2012 Olympic Games in London.

Teng reportedly suffered pulled muscle in his forearm in Northern Ireland, where the team trained before traveling to London and where the alternates continued training. Teng was prepared to take part in Wednesday's podium training, but Guo was called to London to officially replace Teng.

"Judging by the current situation, the committee has made the decision that Guo Weiyang will take Teng Haibin's place to compete in London," Chinese men's head coach Huang Yubin said.

The loss of Teng is a blow to the Chinese men, who will be in a tough battle to defend their Olympic title. Teng, the 2003 world champion and 2004 Olympic champion on pommel horse, was expected to contribute strong scores on pommel horse and parallel bars.

Teng famously performed disastrously during the team finals at the 2004 Olympics in Athens, where China finished out of the medals. He failed to make the team to the 2008 Olympics in Beijing, but returned to help his Chinese team win the 2010 and 2011 Worlds.

On his microblog, Teng wrote that he was grateful for the support and trust of the coaches, who gave him to the last minute to recover.

"Thank you for your support and encouragement, thank you my brothers for all your comfort, thank you to the leadership for your trust in giving me the opportunity so I can fight for the dream under my last vestige of strength," he wrote. "Rest assured I will be strong, I will be fuel for my brothers! I will stand together with you, fighting with you!"

Huang said he was nervous this could cause a domino effect of bad luck for his team.

"Once one bad thing happens, many other things become more difficult," he said. "Now, I'm very worried about the Games."

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